Thanks ostroffjh. kmymoney -v returns 5.2.0 so I got the upgrade. I did some more troubleshooting and here’s what I found:
My db file is an encrypted SQLite file. When I try opening the db through the terminal, KMM launches and then this error shows up:
I click OK and control is handed back to KMM. No file was loaded.
If I then try to open the same file from the recents list, I get a window to enter the file password. Enter my password and click ok and KMM hangs until I close the window.